Key Switch Threshold Control for Faster Repeated Keystrokes
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Solution Overview
Problem
Existing key switch devices struggle to balance fast initial input detection with quick return detection, making it difficult to repeatedly hit the same key at high speed, which is unsuitable for e-sports that require rapid input operations.
Innovation Solution
A key switch device with a pressing amount detector, A/D converter, and operating point storage unit that sets multiple operating points for switching between ON and OFF states based on digital data, using hysteresis to ensure fast and accurate key operation detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a small threshold value is set for fast on-detection, then the initial input operation is detected faster, but the distance to the full-stroke point increases causing slower off-detection
Solution Approach 1:
The patent applies parameter changes by implementing multiple threshold values (first threshold and second threshold) instead of a single threshold. The first threshold is set lower for fast on-detection, while the second threshold is set higher for fast off-detection. This changes the detection parameters dynamically based on the key press state, resolving the contradiction between fast on-detection and fast off-detection.
Solution Approach 2:
The patent segments the single threshold detection into two separate threshold levels. The first threshold handles the initial press detection (on-detection), and the second threshold handles the release detection (off-detection). This segmentation allows each threshold to be optimized for its specific function, enabling both fast on-detection and fast off-detection.
2Speed
If a large threshold value is set for fast off-detection, then the key return is detected faster, but the initial input operation detection is delayed
Solution Approach 1:
The patent changes the detection parameter (threshold value) based on the operational state. When the key is pressed, the system uses the first threshold for detection. When the key is released, the system switches to using the second threshold. This dynamic parameter change allows optimization for both on-detection and off-detection speeds.
Solution Approach 2:
The patent introduces dynamics by making the threshold value changeable rather than fixed. The threshold dynamically switches between the first threshold and second threshold based on whether the key is in a pressed state or released state. This dynamic adaptation resolves the contradiction by allowing the system to optimize for the current operational requirement.
3Device complexity
If a single threshold value is used, then the device structure is simple, but it cannot achieve both fast on-detection and fast off-detection
Solution Approach 1:
The patent changes from a single threshold parameter to multiple threshold parameters (first threshold and second threshold). This parameter expansion enables the system to achieve both fast on-detection and fast off-detection, improving key press speed despite the increased complexity. The benefit in productivity outweighs the moderate increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables early detection of key operations and rapid switching between ON and OFF states, allowing for increased speed and efficiency in repeated key presses, suitable for e-sports applications.
Implementation Method 1
a key that is configured to output a signal corresponding to a pressing amount; a pressing amount detector that is configured to detect the pressing amount of the key
Data Source
AI summary
A key switch device includes: a key that is configured to output a signal corresponding to a pressing amount; a pressing amount detector that is configured to detect the pressing amount of the key; an A/D converter that is configured to convert the pressing amount of the key into digital data; and a RAM that is configured to store multiple operating points for switching between ON and OFF states of the key according to the digital data. In addition, the key switch device includes an output signal control unit that is configured to output an ON signal when the pressing amount exceeds any one of the operating points in a direction in which the pressing amount of the key increases, and to output an OFF signal when the pressing amount falls below any one of the operating points in a direction in which the pressing amount of the key decreases.